It is sad and I mean "Grave of the fireflies"-like sad and beautiful at the same time. There is nothing more you might want from an anti-war movie, sweet child caught amids the terrors of human stupidity.
Barefoot Gen takes us on a tour through devastated Hiroshima, making a clear point of Japan unnecessarily prolonging the war and USA being to much eager to show off their power. I know we are unable to question decisions made in a time we did not live in, but still it is good to know what should not be repeated. And such things are best shown through the eyes of a child, which is exactly what Barefoot Gen does.
Considering the age of this movie, visuals are still good enough to send the message they were supposed to, creating a pretty strong experience through some quite explicit content.
Watch it, remember it and be prepared to shed a tear.